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We propose to measure the expansion parallax of the nebulae around the binary symbiotic Miras He 2-104 {the Southern Crab} and He 2-147 by means of high resolution WFPC2/F658N images to be taken at two different epochs. Given the large outward velocities of these nebulae inferred from ground-based spectroscopy, their apparent expansion can be

GRS 1747-312 is a bright transient X-ray source in the globular cluster Terzan 6 with quasi-periodic outbursts approximately every 4.5 months. We carried out 2-60 keV target-of-opportunity observations during eight outbursts with the Proportional Counter Array on the RXTE satellite, for a total exposure time of 301 ks, and detect the first

Several members of the COROT Seismology Working Group (SWG) have performed several ``hare-and-hound'' exercises to prepare the data exploitation of the mission in the past few years. These exercises consist in reproducing a theoretical model on the basis of a light curve obtained from a frequency spectrum computed from an ``unknown'' theoretical

We report the identification of the cataclysmic variable 1RXS J062518.2+733433 as an intermediate polar. The orbital period of the system is determined to be 283.0+/-0.2 min from the radial velocity variation of Hα, measured in an extensive set of time-resolved spectra. Differential optical photometry obtained over a base line of three weeks

All the observations were made at the Harlan J. Smith 2.7-m telescope at McDonald Observatory, using the 2dcoude echelle spectrometer (Tull et al., 1995PASP..107..251T) with a 2048x2048 pixel Tektronix charge-coupled device (CCD) as detector. (3 data files).